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arxiv: 1205.6779 · v3 · submitted 2012-05-30 · ✦ hep-th

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Ambiguities in the gravitational correction of quantum electrodynamics

J. C. C. Felipe , L. A. Cabral , L. C. T. Brito , Marcos Sampaio , M. C. Nemes
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classification ✦ hep-th
keywords gravitationalarbitrarydependentambiguitiesasymptoticbeenbetacompatible
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We verify that quadratic divergences stemming from gravitational corrections to QED which have been conjectured to lead to asymptotic freedom near Planck scale are arbitrary (regularization dependent) and compatible with zero. Moreover we explicitly show that such arbitrary term contributes to the beta function of QED in a gauge dependent way in the gravitational sector.

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    Quantum gravity contributions to the beta functions of gauge and Yukawa couplings are derived via the Schwinger proper-time flow equation; their dependence on gauge fixing and regulators is quantified at gravity's int...